4 Pin 7 Pin Trailer Wiring Diagram Light Plug

This article shows 4 ,7 pin trailer wiring diagram connector and step how to wire a trailer harness with color code ,there are some intricacies involved in wiring a trailer. Some trailers come with different connectors for cars and some have different wiring styles. If you follow our trailer wiring diagrams, you will get it right. Some connectors are 4-pin while some are 7-pin.

4 pin trailer light wiring diagram :

4-Pin Connectors

4-pin connectors are the standard used for most trailers. Many trailers have three circuits. The circuits are for left and right brake lights and running lights. Three wires are for the trailer while the last wire is the ground wire. The ground wire should be run from the frame of the vehicle to the trailer. There must be a very consistent metal to metal contact for the ground wire. So, do not run the wire from the bumper or the hitch of the car. The 4-pin standard flat style connector has four contacts with a male pin on the vehicle side for the ground.

Wiring the 4-pin connector

You will need a volt meter and a cutting plier to splice the wires. Turn on the running lamps of your vehicle. Probe the wiring to determine which of the wire that leads to the taillight is for the running lamp. Splice this wire and bring it to the vehicle end of the connector. The connection diagram below will tell you the exact place to place the wire. Repeat the process above for the left turn signal and the right turn signal lights

4 pin trailer plug  light wiring diagram color code

Thir is standard color code for a trailer light 4 wire :

  • Brown wire:  Tail light and marker light
  • Green wire :  Right Turn Signal
  • Yellow wire:  Lift Turn Signal
  • White wire :  Trailer Ground

7 pin trailer light wiring diagram :

7-Pin Connectors

7-pin connectors are needed because some trailers need extra connections due to the fact that they have multiple circuits. There are pins for electric trailer brakes, auxiliary power and reverse lights.

7 pin trailer plug  light wiring diagram color code

Thir is standard color code for a trailer light  7wire 
  • White wire :  Trailer Ground
  • Brown wire:  Tail light and marker light
  • Green wire :  Right Turn Signal
  • Yellow wire:  Lift Turn Signal
  • Blue wire    :  Trailer  Brake
  • red wire      : Auxiliary Power

Extra Notes

  • It is good to smear some dielectric grease on the connectors so that the pins will not be corroded by moisture.
  • Ensure everything is properly tightened and fixed so you do not have a loose connection. It will also save you the stress of troubleshooting later on.
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How To Wire An Electrical Outlet Wiring Diagram

How to wire an electrical outlet wiring diagram ,Wiring an electrical outlet / receptacle is quite an easy job. If you are fixing more than one outlet, the wiring can be done in parallel or in series.


how to wire Multiple electrical Outlet receptacle In Parallel serie  Wiring Diagram

How To Wire An Electrical Outlet :

  • Switch off the mains: You should switch off electrical power from the mains to avoid electrocution. One can’t be too careful. 
  • Run the cable from the circuit breaker to the location of the electrical outlet: Your cable should be long enough to reach each socket. The cable must also be strong enough to support the kind of load you want it to carry. 
  • Strip/peel off the cable before it enters the socket box: You can push in the cable to the box before screwing or nailing the box to the wall. Ensure the cable you feed in is long enough to reach the terminals of the socket. 
  • Connect the wires to the receptacles: The neutral, earth and live wire should be connected to the box. The earth wire is usually green/yellow while the live is usually pink/red. The neutral could be white or black. But these color schematics are subject to change depending on your country. The socket receptacles are usually marked with signs to indicate the position that each wire should go. 
  • Multiple outlets: To wire multiple outlets, follow the circuit diagrams posted in this article. 

Multiple Outlet In Serie Wiring Diagram :

For wiring in series, the terminal screws are the means for passing voltage from one receptacle to another. Any break or malfunction in one outlet will cause all the other outlets to fail.

how to wire Multiple Outlet In serie electrical Wiring Diagram

Multiple Outlet In Parallel Wiring Diagram :

When wiring receptacles in parallel, the wires are spliced to a pigtail that is connected to every outlet. The voltage at each outlet is not dependent on the other outlets.

how to wire Multiple Outlet In Parallel electrical Wiring Diagram

Electrical Outlet with light fixture wiring diagram :

electrical outlet 2 way switch wiring diagram how to wire light with receptacl

NOTE :  white wires marked with a black circle are HOT not Neutral 

Electrical outlet with to way switch in switch box wire diagram:

2 way switch with electrical outlet  wiring diagram how to wire outlet with light switch

Double outlet in one box wiring diagram :

double outlet box wiring diagram in the middle of a run in one box

Outlet controlled by switch in one box wire diagram :

wiring  outlets controlled 2 way switch  in one box diagram

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